Current research (since Sept 2015)
- Field spectral sampling of vegetation
Help to establish the spectral sampling network across Nordic region
Live field data
- A prototype PPI system, support by LUCCI WP1
Data logger system: the prototype is based on Arduino single board microcontroller, together with various shield and breakout board. The system including a TFT screen (with or without touch screen functionality) for instantaneous data display and data storage (with micro 1 G SD card), a real-time clock (RTC) for data logging (with on-chip temperature sensor), a 24 bit Delta-Sigma ADC for high precision voltage data measurement (with PGA and 50/60Hz rejection). The system can directly read Decagon NDVI sensor based on SDI-12 protocol with a sampling interval as fast as 5 seconds per sample (Degacon EM50 is 1 minute sample interval).
The PCB will be made for the final product.
Sensor system: interference optical filter + photodiode. we use
Previous research (2010-2015)
I work on remote sensing phenology of vegetation over European high northern latitudes, primarily boreal forests. Both satellite and near-surface remote sensing are used in my study. I have a strong supervisory team: Remote sensing/GIS expert: Prof. Dr. Lars Eklundh, Plant Ecologist: Assoc. Prof. Dr. Anna Maria Jönsson. Two mathematicians: Prof. Dr. Per Jönsson, and Dr. Johan Lindström.
Observing boreal forest phenology by satellites 700 km high in the space is tricky. Annual Greenbiomass variation of evergreen trees is less noticeable than that of deciduous trees. Snow seasonality dominates satellite-retrived phenology over northern latitudes. The satellite results need further ground varification from all aspects. We have 7 ground spectral tower sites across northern Europe and Greenland. We showed how to compute spectral sensor footprint with oblinque view and the hemispherical-conical refletance factor from modelled vegetation BRDF. I spent 3 weeks in Field Spectral Facility of Edinburgh University with Dr. Alasdair MacArthur doing multi-spectral sensor tests, with a STSM grant from COST EuroSpec Action (Report).
It seems that current vegetation indices for phenology retrieval perform not well enough, neither the microwave remote sensing VOD for northern high latitudes. We proposed our own vegetation index, PPI, computed with red and NIR bands, from the analytical solution of simplified radiative transfer equations.
More info and phenology given by LU and BU
Filed spectral sites
Interests and old work
I have strong intersts in remote sensing, various geophysical methods, hardware and algorithm development. I am enjoying using mathematical statistics for remote sensing studies and programming with matlab, R, visual Basic, C and Fortran. I have small tools written with matlab free for download. My old geophysical work in China is here, and some old publications.
I did my Master of Science with Dr. Veiko Lehsten, "Drivers of global wildfires: statistical analyses" (Contact me for known mistakes in the thesis), and another Master of Engineering in the Institute of Geology and Geophysics of Chinese Academy of Sciences with Prof. Yonggui Zhao, and Prof. Sijing Wang, "Seismic surface wave tomography: principle and applications in geotechnical engineering".
I worked for a while in Comprehensive Institute of Geotechinical Investigation & Surveying under Chinese Ministry of Construction, as a chief engineer responsible geophysical survey, and co-drafted the China National Standard "Code for Engineering Geophysical Prospecting and Test in City (CJJ7-2007)" with the leading author Prof. Xuejun Li. A small data logger for building test was developped then and several sets sold in China.
PhD level: PhD Remote sensing course 2013, responsible for "Field spectroscope and instramentation(Presentation)" and "Understanding vegetation indices (Lecture note, Presentation)"
Master level: NGEN08, Master level, HT2 2013, responsible for a small part
Bachelor level: GISA01, GISN21, Introduction to geographical information system, Internet-based course, reviewing student exercise in Vector analysis and Visualization. Giving remote desktop instruction and help when necessary
High-school level: Remote sensing of vegetation, you can do it in your garden. Lecture for high school students Mar. 2013 (Presentation)
I reviewed papers for these journals: Remote Sensing of Environment, Biogeoscience, Remote sensing, International Journal of Remote sensing, Journal of Arid area.
Retrieved from Lund University's publications database